Malicious PDF — malware analysis report

Static analysis result for SHA-256 8576b9f9b822ddd0…

MALICIOUS

PDF

76.1 KB Created: 2021-07-01 14:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45d5075099dcd9493a95faa6cf05f731 SHA-1: 4fcb64707ec8f39412b661c7c4262066ecb2a06f SHA-256: 8576b9f9b822ddd007fe608c342217e121b4d09877346a66a9672ec30adaae49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO poisoning attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d714c2b80---35814149668.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e05da997e3---89419880198.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b383c489fa5---17759160162.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b486e712035---38820736325.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/1ad933fc90a08db4b35e44c201f1b645/37813413638.pdf
    • http://renovator.cz/files/file/28546816975.pdf
    • https://ceral.pl/ceral/pliki/file/82133106632.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adc8f8a03c7---84875172763.pdf
    • https://szud94.hu/img/sajatfile/files/mofalunupawuwedefolox.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2f468fd05be689b3a022d81fa5e82009/56723884863.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/6gdedgjgkaqs048qur5sd52fs2/woweripib.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/b668b2e4086e7e0c3db71abb2e2b7d98/96237284563.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e273ac59e---tegojafakiluxetonave.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/7mf0d32cucu6m6ai5ul7d7kte3/46651508600.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdbc974cdf---42699289722.pdf
    • https://nhadatonline24h.com/Images_upload/files/57984150072.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3b1f02bdf---22028906368.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45ba3a8943---xeferaviwonufowoxigez.pdf
    • http://elm3rad.com/file/nukexerufimiwepojukidis.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2a8e1d056---38219835284.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/a37c5cd3cbf7d7b0b6a7b9d277187d3e/5989809114.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071a026c0d05---vunuwexemapeb.pdf
    • http://clinicaveterinariagussago.com/userfiles/files/48930334812.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=free+motorcycle+service+manuals+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7a7.bin
1b4047b64bd7cf6d498d3e69fe342380ffed547c45172f0b228664af16cb3617
pdf-font-stream PDF embedded font (sfnt) at offset 0xC7A7 15968 bytes
font_01_sfnt_off0000f11e.bin
fb2aa153296df6d8473d8db8a9389b8690bb1461a7a313c5611cf94b417d275d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF11E 11040 bytes
font_02_sfnt_off00010ada.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 16792 bytes